package com.simple.io;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.IoUtil;
import lombok.extern.slf4j.Slf4j;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * @author WuChengXing
 * @date 2021/9/6
 */
@Slf4j
public class ZipUtils {

    /**
     * 传输文件的块大小
     */
    private static final int BUFFER_SIZE = 2 * 1024;

    /**
     * 基本路径
     */
    public static final String BASE_DIR = "tmpRoot";

    /**
     * 系统临时文件
     */
    public static String BASE_PATH = System.getProperty("java.io.tmpdir") + BASE_DIR;

    /**
     * 系统文件分隔符
     */
    public static String SEPARATOR = System.getProperty("file.separator");

    /**
     * 创建文件夹
     *
     * @param targetDir
     * @return
     */
    public static String createTmpDir(String targetDir) {
        String tmpDir = BASE_PATH + SEPARATOR + targetDir;
        File file = new File(tmpDir);
        if (!file.exists()) {
            boolean mkdir = file.mkdir();
            if (mkdir) {
                log.info("create dir success: {}", tmpDir);
                return tmpDir;
            }
            log.info("create dir fail: {}", tmpDir);
            return "";
        } else {
            log.info("dir already exist: {}", tmpDir);
            return tmpDir;
        }
    }

    public static String createTmpDir() {
        // export base path
        File file = new File(BASE_PATH);
        if (!file.exists()) {
            boolean mkdir = file.mkdir();
            if (mkdir) {
                log.info("create dir success: {}", BASE_PATH);
                return BASE_PATH;
            } else {
                log.info("create dir fail: {}", BASE_PATH);
                return "";
            }
        } else {
            log.info("dir already exist: {}", BASE_PATH);
            return BASE_PATH;
        }
    }

    public static void deleteTmpDir() {
        boolean del = FileUtil.del(BASE_PATH);
        if (del) {
            log.info("delete dir success: {}", BASE_PATH);
        } else {
            log.info("delete dir fail: {}", BASE_PATH);
        }
    }

    /**
     * 下载远程文件
     *
     * @param remoteFilePath
     * @param downloadPath
     */
    public static void downloadFile(String remoteFilePath, String downloadPath) {
        URL urlfile = null;
        HttpURLConnection httpUrl = null;
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        File f = new File(downloadPath);
        try {
            urlfile = new URL(remoteFilePath);
            httpUrl = (HttpURLConnection) urlfile.openConnection();
            httpUrl.connect();
            bis = new BufferedInputStream(httpUrl.getInputStream());
            bos = new BufferedOutputStream(new FileOutputStream(f));
            int len = BUFFER_SIZE;
            byte[] b = new byte[len];
            while ((len = bis.read(b)) != -1) {
                bos.write(b, 0, len);
            }
            bos.flush();
            bis.close();
            httpUrl.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close(bis);
            close(bos);
        }
    }

    /**
     * 压缩成ZIP
     *
     * @param srcDir           压缩文件夹路径
     * @param out              压缩文件输出流
     * @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;
     *                         false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
     * @throws RuntimeException 压缩失败会抛出运行时异常
     */
    public static void toZip(String srcDir, OutputStream out, boolean KeepDirStructure) throws RuntimeException {
        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            File sourceFile = new File(srcDir);
            compress(sourceFile, zos, sourceFile.getName(), KeepDirStructure);
            long end = System.currentTimeMillis();
            System.out.println("压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            close(zos);
            close(out);
        }
    }

    /**
     * 关闭流
     *
     * @param t
     * @param <T>
     */
    public static <T extends Closeable> void close(T t) {
        if (t != null) {
            try {
                t.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 压缩成ZIP
     *
     * @param srcFiles 需要压缩的文件列表
     * @param out      压缩文件输出流
     * @throws RuntimeException 压缩失败会抛出运行时异常
     */
    public static void toZip(List<File> srcFiles, OutputStream out) throws RuntimeException {
        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            for (File srcFile : srcFiles) {
                byte[] buf = new byte[BUFFER_SIZE];
                zos.putNextEntry(new ZipEntry(srcFile.getName()));
                int len;
                FileInputStream in = new FileInputStream(srcFile);
                while ((len = in.read(buf)) != -1) {
                    zos.write(buf, 0, len);
                }
                zos.closeEntry();
                in.close();
            }
            long end = System.currentTimeMillis();
            System.out.println("压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 递归压缩方法
     *
     * @param sourceFile       源文件
     * @param zos              zip输出流
     * @param name             压缩后的名称
     * @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;
     *                         false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
     * @throws Exception
     */
    private static void compress(File sourceFile, ZipOutputStream zos, String name, boolean KeepDirStructure) throws Exception {
        byte[] buf = new byte[BUFFER_SIZE];
        if (sourceFile.isFile()) {
            // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
            zos.putNextEntry(new ZipEntry(name));
            // copy文件到zip输出流中
            int len;
            FileInputStream in = new FileInputStream(sourceFile);
            while ((len = in.read(buf)) != -1) {
                zos.write(buf, 0, len);
            }
            // Complete the entry
            zos.closeEntry();
            in.close();
        } else {
            File[] listFiles = sourceFile.listFiles();
            if (listFiles == null || listFiles.length == 0) {
                // 需要保留原来的文件结构时,需要对空文件夹进行处理
                if (KeepDirStructure) {
                    // 空文件夹的处理
                    zos.putNextEntry(new ZipEntry(name + SEPARATOR));
                    // 没有文件，不需要文件的copy
                    zos.closeEntry();
                }
            } else {
                for (File file : listFiles) {
                    // 判断是否需要保留原来的文件结构
                    if (KeepDirStructure) {
                        // 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
                        // 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
                        compress(file, zos, name + SEPARATOR + file.getName(), true);
                    } else {
                        compress(file, zos, file.getName(), false);
                    }
                }
            }
        }
    }

    public static void main(String[] args) throws FileNotFoundException {
        /** 测试压缩方法1  */
        /*FileOutputStream fos1 = new FileOutputStream(new File("d:/mytest01.zip"));
        ZipUtils.toZip("D:/test01", fos1, true);*/

        //System.out.println(getSystemTmpDir());

        String TMP_DIR = createTmpDir("1");
        System.out.println(TMP_DIR);
        deleteTmpDir();
        System.out.println();
        /** 测试压缩方法2  */
        /*List<File> fileList = new ArrayList<>();
        fileList.add(new File("D:/Java/jdk1.7.0_45_64bit/bin/jar.exe"));
        fileList.add(new File("D:/Java/jdk1.7.0_45_64bit/bin/java.exe"));
        FileOutputStream fos2 = new FileOutputStream(new File("c:/mytest02.zip"));
        ZipUtils.toZip(fileList, fos2);*/
    }


}
